diff --git a/docs/.buildinfo b/docs/.buildinfo
index 0885fbe1..4ce8b70f 100644
--- a/docs/.buildinfo
+++ b/docs/.buildinfo
@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: 
-tags: 
+config: 874109c9e8f56215fdcb46cac4aab9f9
+tags: 645f666f9bcd5a90fca523b33c5a78b7
diff --git a/docs/_modules/index.html b/docs/_modules/index.html
index 2bc732ea..a086bc32 100644
--- a/docs/_modules/index.html
+++ b/docs/_modules/index.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>Overview: module code &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>Overview: module code &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
       </ul>
     </div>  
 
@@ -85,12 +85,12 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/TFCluster.html b/docs/_modules/tensorflowonspark/TFCluster.html
index 8f7bde23..2cd20b24 100644
--- a/docs/_modules/tensorflowonspark/TFCluster.html
+++ b/docs/_modules/tensorflowonspark/TFCluster.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFCluster &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFCluster &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -233,7 +233,8 @@ <h1>Source code for tensorflowonspark.TFCluster</h1><div class="highlight"><pre>
         <span class="n">tb_url</span> <span class="o">=</span> <span class="s2">&quot;http://</span><span class="si">{0}</span><span class="s2">:</span><span class="si">{1}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">node</span><span class="p">[</span><span class="s1">&#39;host&#39;</span><span class="p">],</span> <span class="n">node</span><span class="p">[</span><span class="s1">&#39;tb_port&#39;</span><span class="p">])</span>
     <span class="k">return</span> <span class="n">tb_url</span></div></div>
 
-<div class="viewcode-block" id="run"><a class="viewcode-back" href="../../tensorflowonspark.TFCluster.html#tensorflowonspark.TFCluster.run">[docs]</a><span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">map_fun</span><span class="p">,</span> <span class="n">tf_args</span><span class="p">,</span> <span class="n">num_executors</span><span class="p">,</span> <span class="n">num_ps</span><span class="p">,</span> <span class="n">tensorboard</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">input_mode</span><span class="o">=</span><span class="n">InputMode</span><span class="o">.</span><span class="n">TENSORFLOW</span><span class="p">,</span> <span class="n">log_dir</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">queues</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;input&#39;</span><span class="p">,</span> <span class="s1">&#39;output&#39;</span><span class="p">]):</span>
+<div class="viewcode-block" id="run"><a class="viewcode-back" href="../../tensorflowonspark.TFCluster.html#tensorflowonspark.TFCluster.run">[docs]</a><span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">map_fun</span><span class="p">,</span> <span class="n">tf_args</span><span class="p">,</span> <span class="n">num_executors</span><span class="p">,</span> <span class="n">num_ps</span><span class="p">,</span> <span class="n">tensorboard</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">input_mode</span><span class="o">=</span><span class="n">InputMode</span><span class="o">.</span><span class="n">TENSORFLOW</span><span class="p">,</span>
+        <span class="n">log_dir</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">driver_ps_nodes</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">queues</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;input&#39;</span><span class="p">,</span> <span class="s1">&#39;output&#39;</span><span class="p">]):</span>
   <span class="sd">&quot;&quot;&quot;Starts the TensorFlowOnSpark cluster and Runs the TensorFlow &quot;main&quot; function on the Spark executors</span>
 
 <span class="sd">  Args:</span>
@@ -245,6 +246,7 @@ <h1>Source code for tensorflowonspark.TFCluster</h1><div class="highlight"><pre>
 <span class="sd">    :tensorboard: boolean indicating if the chief worker should spawn a Tensorboard server.</span>
 <span class="sd">    :input_mode: TFCluster.InputMode</span>
 <span class="sd">    :log_dir: directory to save tensorboard event logs.  If None, defaults to a fixed path on local filesystem.</span>
+<span class="sd">    :driver_ps_nodes: run the PS nodes on the driver locally instead of on the spark executors; this help maximizing computing resources (esp. GPU). You will need to set cluster_size = num_executors + num_ps</span>
 <span class="sd">    :queues: *INTERNAL_USE*</span>
 
 <span class="sd">  Returns:</span>
@@ -253,10 +255,14 @@ <h1>Source code for tensorflowonspark.TFCluster</h1><div class="highlight"><pre>
   <span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Reserving TFSparkNodes </span><span class="si">{0}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s2">&quot;w/ TensorBoard&quot;</span> <span class="k">if</span> <span class="n">tensorboard</span> <span class="k">else</span> <span class="s2">&quot;&quot;</span><span class="p">))</span>
   <span class="k">assert</span> <span class="n">num_ps</span> <span class="o">&lt;</span> <span class="n">num_executors</span>
 
+  <span class="k">if</span> <span class="n">driver_ps_nodes</span> <span class="ow">and</span> <span class="n">input_mode</span> <span class="o">!=</span> <span class="n">InputMode</span><span class="o">.</span><span class="n">TENSORFLOW</span><span class="p">:</span>
+    <span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s1">&#39;running PS nodes on driver locally is only supported in InputMode.TENSORFLOW&#39;</span><span class="p">)</span>
+
   <span class="c1"># build a cluster_spec template using worker_nums</span>
   <span class="n">cluster_template</span> <span class="o">=</span> <span class="p">{}</span>
   <span class="n">cluster_template</span><span class="p">[</span><span class="s1">&#39;ps&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nb">range</span><span class="p">(</span><span class="n">num_ps</span><span class="p">)</span>
   <span class="n">cluster_template</span><span class="p">[</span><span class="s1">&#39;worker&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nb">range</span><span class="p">(</span><span class="n">num_ps</span><span class="p">,</span> <span class="n">num_executors</span><span class="p">)</span>
+  <span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;worker node range </span><span class="si">%s</span><span class="s2">, ps node range </span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">cluster_template</span><span class="p">[</span><span class="s1">&#39;worker&#39;</span><span class="p">],</span> <span class="n">cluster_template</span><span class="p">[</span><span class="s1">&#39;ps&#39;</span><span class="p">]))</span>
 
   <span class="c1"># get default filesystem from spark</span>
   <span class="n">defaultFS</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jsc</span><span class="o">.</span><span class="n">hadoopConfiguration</span><span class="p">()</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;fs.defaultFS&quot;</span><span class="p">)</span>
@@ -281,7 +287,25 @@ <h1>Source code for tensorflowonspark.TFCluster</h1><div class="highlight"><pre>
     <span class="s1">&#39;working_dir&#39;</span><span class="p">:</span> <span class="n">working_dir</span><span class="p">,</span>
     <span class="s1">&#39;server_addr&#39;</span><span class="p">:</span> <span class="n">server_addr</span>
   <span class="p">}</span>
-  <span class="n">nodeRDD</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">parallelize</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="n">num_executors</span><span class="p">),</span> <span class="n">num_executors</span><span class="p">)</span>
+  <span class="k">if</span> <span class="n">driver_ps_nodes</span><span class="p">:</span>
+    <span class="n">nodeRDD</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">parallelize</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="n">num_ps</span><span class="p">,</span> <span class="n">num_executors</span><span class="p">),</span> <span class="n">num_executors</span> <span class="o">-</span> <span class="n">num_ps</span><span class="p">)</span>
+  <span class="k">else</span><span class="p">:</span>
+    <span class="n">nodeRDD</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">parallelize</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="n">num_executors</span><span class="p">),</span> <span class="n">num_executors</span><span class="p">)</span>
+
+  <span class="k">if</span> <span class="n">driver_ps_nodes</span><span class="p">:</span>
+    <span class="k">def</span> <span class="nf">_start_ps</span><span class="p">(</span><span class="n">node_index</span><span class="p">):</span>
+      <span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;starting ps node locally </span><span class="si">%d</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">node_index</span><span class="p">)</span>
+      <span class="n">TFSparkNode</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">map_fun</span><span class="p">,</span>
+                      <span class="n">tf_args</span><span class="p">,</span>
+                      <span class="n">cluster_meta</span><span class="p">,</span>
+                      <span class="n">tensorboard</span><span class="p">,</span>
+                      <span class="n">log_dir</span><span class="p">,</span>
+                      <span class="n">queues</span><span class="p">,</span>
+                      <span class="n">background</span><span class="o">=</span><span class="p">(</span><span class="n">input_mode</span> <span class="o">==</span> <span class="n">InputMode</span><span class="o">.</span><span class="n">SPARK</span><span class="p">))([</span><span class="n">node_index</span><span class="p">])</span>
+    <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">cluster_template</span><span class="p">[</span><span class="s1">&#39;ps&#39;</span><span class="p">]:</span>
+      <span class="n">ps_thread</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="k">lambda</span><span class="p">:</span> <span class="n">_start_ps</span><span class="p">(</span><span class="n">i</span><span class="p">))</span>
+      <span class="n">ps_thread</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="kc">True</span>
+      <span class="n">ps_thread</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
 
   <span class="c1"># start TF on a background thread (on Spark driver) to allow for feeding job</span>
   <span class="k">def</span> <span class="nf">_start</span><span class="p">():</span>
@@ -291,7 +315,7 @@ <h1>Source code for tensorflowonspark.TFCluster</h1><div class="highlight"><pre>
                                               <span class="n">tensorboard</span><span class="p">,</span>
                                               <span class="n">log_dir</span><span class="p">,</span>
                                               <span class="n">queues</span><span class="p">,</span>
-                                              <span class="p">(</span><span class="n">input_mode</span> <span class="o">==</span> <span class="n">InputMode</span><span class="o">.</span><span class="n">SPARK</span><span class="p">)))</span>
+                                              <span class="n">background</span><span class="o">=</span><span class="p">(</span><span class="n">input_mode</span> <span class="o">==</span> <span class="n">InputMode</span><span class="o">.</span><span class="n">SPARK</span><span class="p">)))</span>
   <span class="n">t</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">_start</span><span class="p">)</span>
   <span class="n">t</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
 
@@ -366,13 +390,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/TFManager.html b/docs/_modules/tensorflowonspark/TFManager.html
index 87ece63f..fe686d8d 100644
--- a/docs/_modules/tensorflowonspark/TFManager.html
+++ b/docs/_modules/tensorflowonspark/TFManager.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFManager &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFManager &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -146,13 +146,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/TFNode.html b/docs/_modules/tensorflowonspark/TFNode.html
index bbfccc6f..e1588097 100644
--- a/docs/_modules/tensorflowonspark/TFNode.html
+++ b/docs/_modules/tensorflowonspark/TFNode.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFNode &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFNode &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -354,13 +354,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/TFSparkNode.html b/docs/_modules/tensorflowonspark/TFSparkNode.html
index f2d918d8..353f2fb0 100644
--- a/docs/_modules/tensorflowonspark/TFSparkNode.html
+++ b/docs/_modules/tensorflowonspark/TFSparkNode.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFSparkNode &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFSparkNode &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -80,7 +80,7 @@ <h1>Source code for tensorflowonspark.TFSparkNode</h1><div class="highlight"><pr
 <span class="sd">    :worker_num: integer identifier for this executor, per ``nodeRDD = sc.parallelize(range(num_executors), num_executors).``</span>
 <span class="sd">    :job_name: TensorFlow job name (e.g. &#39;ps&#39; or &#39;worker&#39;) of this TF node, per cluster_spec.</span>
 <span class="sd">    :task_index: integer rank per job_name, e.g. &quot;worker:0&quot;, &quot;worker:1&quot;, &quot;ps:0&quot;.</span>
-<span class="sd">    :cluster_spec: tf.train.ClusterSpec</span>
+<span class="sd">    :cluster_spec: dictionary for constructing a tf.train.ClusterSpec.</span>
 <span class="sd">    :defaultFS: string representation of default FileSystem, e.g. ``file://`` or ``hdfs://&lt;namenode&gt;:8020/``.</span>
 <span class="sd">    :working_dir: the current working directory for local filesystems, or YARN containers.</span>
 <span class="sd">    :mgr: TFManager instance for this Python worker.</span>
@@ -317,8 +317,11 @@ <h1>Source code for tensorflowonspark.TFSparkNode</h1><div class="highlight"><pr
 
     <span class="k">if</span> <span class="n">job_name</span> <span class="o">==</span> <span class="s1">&#39;ps&#39;</span> <span class="ow">or</span> <span class="n">background</span><span class="p">:</span>
       <span class="c1"># invoke the TensorFlow main function in a background thread</span>
-      <span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Starting TensorFlow </span><span class="si">{0}</span><span class="s2">:</span><span class="si">{1}</span><span class="s2"> on cluster node </span><span class="si">{2}</span><span class="s2"> on background process&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">job_name</span><span class="p">,</span> <span class="n">task_index</span><span class="p">,</span> <span class="n">worker_num</span><span class="p">))</span>
+      <span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Starting TensorFlow </span><span class="si">{0}</span><span class="s2">:</span><span class="si">{1}</span><span class="s2"> as </span><span class="si">{2}</span><span class="s2"> on cluster node </span><span class="si">{3}</span><span class="s2"> on background process&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
+        <span class="n">job_name</span><span class="p">,</span> <span class="n">task_index</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="n">worker_num</span><span class="p">))</span>
       <span class="n">p</span> <span class="o">=</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">Process</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">wrapper_fn</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">(</span><span class="n">tf_args</span><span class="p">,</span> <span class="n">ctx</span><span class="p">))</span>
+      <span class="k">if</span> <span class="n">job_name</span> <span class="o">==</span> <span class="s1">&#39;ps&#39;</span><span class="p">:</span>
+        <span class="n">p</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="kc">True</span>
       <span class="n">p</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
 
       <span class="c1"># for ps nodes only, wait indefinitely in foreground thread for a &quot;control&quot; event (None == &quot;stop&quot;)</span>
@@ -506,13 +509,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/dfutil.html b/docs/_modules/tensorflowonspark/dfutil.html
index 7b3d4bba..94fe65bd 100644
--- a/docs/_modules/tensorflowonspark/dfutil.html
+++ b/docs/_modules/tensorflowonspark/dfutil.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.dfutil &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.dfutil &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -286,13 +286,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/gpu_info.html b/docs/_modules/tensorflowonspark/gpu_info.html
index 24c7b5e0..ec909beb 100644
--- a/docs/_modules/tensorflowonspark/gpu_info.html
+++ b/docs/_modules/tensorflowonspark/gpu_info.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.gpu_info &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.gpu_info &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -242,13 +242,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/marker.html b/docs/_modules/tensorflowonspark/marker.html
index 0af8dba7..a914e583 100644
--- a/docs/_modules/tensorflowonspark/marker.html
+++ b/docs/_modules/tensorflowonspark/marker.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.marker &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.marker &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -92,13 +92,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/pipeline.html b/docs/_modules/tensorflowonspark/pipeline.html
index 2f826e4f..88a2b366 100644
--- a/docs/_modules/tensorflowonspark/pipeline.html
+++ b/docs/_modules/tensorflowonspark/pipeline.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.pipeline &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.pipeline &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -148,12 +148,17 @@ <h1>Source code for tensorflowonspark.pipeline</h1><div class="highlight"><pre>
 
 <div class="viewcode-block" id="HasNumPS"><a class="viewcode-back" href="../../tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasNumPS">[docs]</a><span class="k">class</span> <span class="nc">HasNumPS</span><span class="p">(</span><span class="n">Params</span><span class="p">):</span>
   <span class="n">num_ps</span> <span class="o">=</span> <span class="n">Param</span><span class="p">(</span><span class="n">Params</span><span class="o">.</span><span class="n">_dummy</span><span class="p">(),</span> <span class="s2">&quot;num_ps&quot;</span><span class="p">,</span> <span class="s2">&quot;Number of PS nodes in cluster&quot;</span><span class="p">,</span> <span class="n">typeConverter</span><span class="o">=</span><span class="n">TypeConverters</span><span class="o">.</span><span class="n">toInt</span><span class="p">)</span>
+  <span class="n">driver_ps_nodes</span> <span class="o">=</span> <span class="n">Param</span><span class="p">(</span><span class="n">Params</span><span class="o">.</span><span class="n">_dummy</span><span class="p">(),</span> <span class="s2">&quot;driver_ps_nodes&quot;</span><span class="p">,</span> <span class="s2">&quot;Run PS nodes on driver locally&quot;</span><span class="p">,</span> <span class="n">typeConverter</span><span class="o">=</span><span class="n">TypeConverters</span><span class="o">.</span><span class="n">toBoolean</span><span class="p">)</span>
   <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
     <span class="nb">super</span><span class="p">(</span><span class="n">HasNumPS</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
 <div class="viewcode-block" id="HasNumPS.setNumPS"><a class="viewcode-back" href="../../tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasNumPS.setNumPS">[docs]</a>  <span class="k">def</span> <span class="nf">setNumPS</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
     <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_set</span><span class="p">(</span><span class="n">num_ps</span><span class="o">=</span><span class="n">value</span><span class="p">)</span></div>
 <div class="viewcode-block" id="HasNumPS.getNumPS"><a class="viewcode-back" href="../../tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasNumPS.getNumPS">[docs]</a>  <span class="k">def</span> <span class="nf">getNumPS</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
-    <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">getOrDefault</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">num_ps</span><span class="p">)</span></div></div>
+    <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">getOrDefault</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">num_ps</span><span class="p">)</span></div>
+<div class="viewcode-block" id="HasNumPS.setDriverPSNodes"><a class="viewcode-back" href="../../tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasNumPS.setDriverPSNodes">[docs]</a>  <span class="k">def</span> <span class="nf">setDriverPSNodes</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
+    <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_set</span><span class="p">(</span><span class="n">driver_ps_nodes</span><span class="o">=</span><span class="n">value</span><span class="p">)</span></div>
+<div class="viewcode-block" id="HasNumPS.getDriverPSNodes"><a class="viewcode-back" href="../../tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasNumPS.getDriverPSNodes">[docs]</a>  <span class="k">def</span> <span class="nf">getDriverPSNodes</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+    <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">getOrDefault</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">driver_ps_nodes</span><span class="p">)</span></div></div>
 
 <div class="viewcode-block" id="HasOutputMapping"><a class="viewcode-back" href="../../tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasOutputMapping">[docs]</a><span class="k">class</span> <span class="nc">HasOutputMapping</span><span class="p">(</span><span class="n">Params</span><span class="p">):</span>
   <span class="n">output_mapping</span> <span class="o">=</span> <span class="n">Param</span><span class="p">(</span><span class="n">Params</span><span class="o">.</span><span class="n">_dummy</span><span class="p">(),</span> <span class="s2">&quot;output_mapping&quot;</span><span class="p">,</span> <span class="s2">&quot;Mapping of output tensor to output DataFrame column&quot;</span><span class="p">,</span> <span class="n">typeConverter</span><span class="o">=</span><span class="n">TFTypeConverters</span><span class="o">.</span><span class="n">toDict</span><span class="p">)</span>
@@ -249,10 +254,14 @@ <h1>Source code for tensorflowonspark.pipeline</h1><div class="highlight"><pre>
   <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">d</span><span class="p">):</span>
     <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">d</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
       <span class="bp">self</span><span class="o">.</span><span class="n">argv</span> <span class="o">=</span> <span class="n">d</span>
+    <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">d</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">d</span><span class="p">)</span>
     <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">d</span><span class="p">,</span> <span class="n">argparse</span><span class="o">.</span><span class="n">Namespace</span><span class="p">):</span>
       <span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="nb">vars</span><span class="p">(</span><span class="n">d</span><span class="p">))</span>
+    <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">d</span><span class="p">,</span> <span class="n">Namespace</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">d</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">)</span>
     <span class="k">else</span><span class="p">:</span>
-      <span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">d</span><span class="p">)</span>
+      <span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s2">&quot;Unsupported Namespace args: </span><span class="si">{}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">d</span><span class="p">))</span>
 
   <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
     <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">argv</span><span class="p">:</span>
@@ -319,6 +328,7 @@ <h1>Source code for tensorflowonspark.pipeline</h1><div class="highlight"><pre>
     <span class="bp">self</span><span class="o">.</span><span class="n">_setDefault</span><span class="p">(</span><span class="n">input_mapping</span><span class="o">=</span><span class="p">{},</span>
                     <span class="n">cluster_size</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span>
                     <span class="n">num_ps</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span>
+                    <span class="n">driver_ps_nodes</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
                     <span class="n">input_mode</span><span class="o">=</span><span class="n">TFCluster</span><span class="o">.</span><span class="n">InputMode</span><span class="o">.</span><span class="n">SPARK</span><span class="p">,</span>
                     <span class="n">protocol</span><span class="o">=</span><span class="s1">&#39;grpc&#39;</span><span class="p">,</span>
                     <span class="n">tensorboard</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
@@ -362,7 +372,8 @@ <h1>Source code for tensorflowonspark.pipeline</h1><div class="highlight"><pre>
         <span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Done saving&quot;</span><span class="p">)</span>
 
     <span class="n">tf_args</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">argv</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">argv</span> <span class="k">else</span> <span class="n">local_args</span>
-    <span class="n">cluster</span> <span class="o">=</span> <span class="n">TFCluster</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">train_fn</span><span class="p">,</span> <span class="n">tf_args</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">cluster_size</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">num_ps</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">tensorboard</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">input_mode</span><span class="p">)</span>
+    <span class="n">cluster</span> <span class="o">=</span> <span class="n">TFCluster</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">train_fn</span><span class="p">,</span> <span class="n">tf_args</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">cluster_size</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">num_ps</span><span class="p">,</span>
+                            <span class="n">local_args</span><span class="o">.</span><span class="n">tensorboard</span><span class="p">,</span> <span class="n">local_args</span><span class="o">.</span><span class="n">input_mode</span><span class="p">,</span> <span class="n">driver_ps_nodes</span><span class="o">=</span><span class="n">local_args</span><span class="o">.</span><span class="n">driver_ps_nodes</span><span class="p">)</span>
     <span class="k">if</span> <span class="n">local_args</span><span class="o">.</span><span class="n">input_mode</span> <span class="o">==</span> <span class="n">TFCluster</span><span class="o">.</span><span class="n">InputMode</span><span class="o">.</span><span class="n">SPARK</span><span class="p">:</span>
       <span class="c1"># feed data, using a deterministic order for input columns (lexicographic by key)</span>
       <span class="n">input_cols</span> <span class="o">=</span> <span class="nb">sorted</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">getInputMapping</span><span class="p">()</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span>
@@ -625,13 +636,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/reservation.html b/docs/_modules/tensorflowonspark/reservation.html
index 0395d357..3fc3020a 100644
--- a/docs/_modules/tensorflowonspark/reservation.html
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   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.reservation &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.reservation &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -322,13 +322,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_modules/tensorflowonspark/util.html b/docs/_modules/tensorflowonspark/util.html
index 304bd05f..b8e36b97 100644
--- a/docs/_modules/tensorflowonspark/util.html
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@@ -5,13 +5,13 @@
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   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.util &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.util &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    '../../',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -34,7 +34,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Module code</a> &#187;</li> 
       </ul>
     </div>  
@@ -101,13 +101,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="../../py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="../../index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="../index.html" >Module code</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/_static/basic.css b/docs/_static/basic.css
index 3c7223b1..607b5f55 100644
--- a/docs/_static/basic.css
+++ b/docs/_static/basic.css
@@ -4,7 +4,7 @@
  *
  * Sphinx stylesheet -- basic theme.
  *
- * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
+ * :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
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@@ -332,6 +332,11 @@ table.docutils {
     border-collapse: collapse;
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+table.align-center {
+    margin-left: auto;
+    margin-right: auto;
+}
+
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diff --git a/docs/_static/classic.css b/docs/_static/classic.css
index 22fa0bde..6cfbfb9c 100644
--- a/docs/_static/classic.css
+++ b/docs/_static/classic.css
@@ -4,7 +4,7 @@
  *
  * Sphinx stylesheet -- classic theme.
  *
- * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
+ * :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
  */
diff --git a/docs/_static/doctools.js b/docs/_static/doctools.js
index 24992e64..0c15c009 100644
--- a/docs/_static/doctools.js
+++ b/docs/_static/doctools.js
@@ -4,7 +4,7 @@
  *
  * Sphinx JavaScript utilities for all documentation.
  *
- * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
+ * :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
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@@ -204,7 +204,7 @@ var Documentation = {
    * see: https://bugzilla.mozilla.org/show_bug.cgi?id=645075
    */
   fixFirefoxAnchorBug : function() {
-    if (document.location.hash)
+    if (document.location.hash && $.browser.mozilla)
       window.setTimeout(function() {
         document.location.href += '';
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diff --git a/docs/_static/jquery.js b/docs/_static/jquery.js
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diff --git a/docs/_static/searchtools.js b/docs/_static/searchtools.js
index 33fedf43..41b83367 100644
--- a/docs/_static/searchtools.js
+++ b/docs/_static/searchtools.js
@@ -4,7 +4,7 @@
  *
  * Sphinx JavaScript utilities for the full-text search.
  *
- * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
+ * :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
  */
diff --git a/docs/_static/sidebar.js b/docs/_static/sidebar.js
index 332bbf24..dfbfb05c 100644
--- a/docs/_static/sidebar.js
+++ b/docs/_static/sidebar.js
@@ -16,7 +16,7 @@
  * Once the browser is closed the cookie is deleted and the position
  * reset to the default (expanded).
  *
- * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
+ * :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
  */
diff --git a/docs/_static/websupport.js b/docs/_static/websupport.js
index 53f6a452..79b18e38 100644
--- a/docs/_static/websupport.js
+++ b/docs/_static/websupport.js
@@ -4,7 +4,7 @@
  *
  * sphinx.websupport utilities for all documentation.
  *
- * :copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
+ * :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
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diff --git a/docs/genindex.html b/docs/genindex.html
index 91cb5cbe..8422ec34 100644
--- a/docs/genindex.html
+++ b/docs/genindex.html
@@ -6,13 +6,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>Index &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>Index &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -35,7 +35,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
       </ul>
     </div>  
 
@@ -146,6 +146,8 @@ <h2 id="D">D</h2>
       <li><a href="tensorflowonspark.reservation.html#tensorflowonspark.reservation.Server.done">done (Server attribute)</a>
 </li>
       <li><a href="tensorflowonspark.reservation.html#tensorflowonspark.reservation.Reservations.done">done() (Reservations method)</a>
+</li>
+      <li><a href="tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasNumPS.driver_ps_nodes">driver_ps_nodes (HasNumPS attribute)</a>
 </li>
   </ul></td>
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@@ -202,15 +204,17 @@ <h2 id="G">G</h2>
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 </li>
       <li><a href="tensorflowonspark.pipeline.html#tensorflowonspark.pipeline.HasClusterSize.getClusterSize">getClusterSize() (HasClusterSize method)</a>
+</li>
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 </li>
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 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
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+</li>
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 </li>
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+</li>
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         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
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         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
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-    <title>Welcome to TensorFlowOnSpark’s documentation! &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>Welcome to TensorFlowOnSpark’s documentation! &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
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@@ -38,7 +38,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.html" title="tensorflowonspark package"
              accesskey="N">next</a> |</li>
-        <li class="nav-item nav-item-0"><a href="#">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="#">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
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@@ -129,12 +129,12 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.html" title="tensorflowonspark package"
              >next</a> |</li>
-        <li class="nav-item nav-item-0"><a href="#">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="#">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
       </ul>
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     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
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\ No newline at end of file
diff --git a/docs/objects.inv b/docs/objects.inv
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+    <title>Python Module Index &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
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         HAS_SOURCE:  true,
@@ -37,7 +37,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="#" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
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@@ -149,12 +149,12 @@ <h3>Navigation</h3>
         <li class="right" >
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              >modules</a> |</li>
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+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
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     <div class="footer" role="contentinfo">
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-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
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diff --git a/docs/search.html b/docs/search.html
index aeb2bbc2..e4bbade3 100644
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@@ -5,13 +5,13 @@
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-    <title>Search &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>Search &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
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         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
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              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
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              >modules</a> |</li>
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+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
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     <div class="footer" role="contentinfo">
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-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
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to TensorFlowOnSpark\u2019s documentation!","tensorflowonspark package","tensorflowonspark.TFCluster module","tensorflowonspark.TFManager module","tensorflowonspark.TFNode module","tensorflowonspark.TFSparkNode module","tensorflowonspark.dfutil module","tensorflowonspark.gpu_info module","tensorflowonspark.marker module","tensorflowonspark.pipeline module","tensorflowonspark.reservation module","tensorflowonspark.reservation_client module","tensorflowonspark.util module"],titleterms:{dfutil:6,document:0,gpu_info:7,indic:0,marker:8,modul:[2,3,4,5,6,7,8,9,10,11,12],packag:1,pipelin:9,reserv:10,reservation_cli:11,submodul:1,tabl:0,tensorflowonspark:[0,1,2,3,4,5,6,7,8,9,10,11,12],tfcluster:2,tfmanag:3,tfnode:4,tfsparknod:5,util:12,welcom:0}})
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diff --git a/docs/tensorflowonspark.TFCluster.html b/docs/tensorflowonspark.TFCluster.html
index 8ca1e8c5..02bf55f7 100644
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     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFCluster module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFCluster module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
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@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
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              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
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@@ -232,7 +232,7 @@ <h3>Navigation</h3>
 
 <dl class="function">
 <dt id="tensorflowonspark.TFCluster.run">
-<code class="descname">run</code><span class="sig-paren">(</span><em>sc, map_fun, tf_args, num_executors, num_ps, tensorboard=False, input_mode=0, log_dir=None, queues=['input', 'output']</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/tensorflowonspark/TFCluster.html#run"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.TFCluster.run" title="Permalink to this definition">¶</a></dt>
+<code class="descname">run</code><span class="sig-paren">(</span><em>sc, map_fun, tf_args, num_executors, num_ps, tensorboard=False, input_mode=0, log_dir=None, driver_ps_nodes=False, queues=['input', 'output']</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/tensorflowonspark/TFCluster.html#run"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.TFCluster.run" title="Permalink to this definition">¶</a></dt>
 <dd><p>Starts the TensorFlowOnSpark cluster and Runs the TensorFlow “main” function on the Spark executors</p>
 <dl class="docutils">
 <dt>Args:</dt>
@@ -256,7 +256,10 @@ <h3>Navigation</h3>
 </tr>
 <tr class="field-even field"><th class="field-name">log_dir:</th><td class="field-body">directory to save tensorboard event logs.  If None, defaults to a fixed path on local filesystem.</td>
 </tr>
-<tr class="field-odd field"><th class="field-name">queues:</th><td class="field-body"><em>INTERNAL_USE</em></td>
+<tr class="field-odd field"><th class="field-name" colspan="2">driver_ps_nodes:</th></tr>
+<tr class="field-odd field"><td>&#160;</td><td class="field-body">run the PS nodes on the driver locally instead of on the spark executors; this help maximizing computing resources (esp. GPU). You will need to set cluster_size = num_executors + num_ps</td>
+</tr>
+<tr class="field-even field"><th class="field-name">queues:</th><td class="field-body"><em>INTERNAL_USE</em></td>
 </tr>
 </tbody>
 </table>
@@ -316,13 +319,13 @@ <h3>Navigation</h3>
         <li class="right" >
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              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
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-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
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diff --git a/docs/tensorflowonspark.TFManager.html b/docs/tensorflowonspark.TFManager.html
index 3213f80c..682e6ec9 100644
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-    <title>tensorflowonspark.TFManager module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFManager module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
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@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFCluster.html" title="tensorflowonspark.TFCluster module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
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@@ -157,13 +157,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFCluster.html" title="tensorflowonspark.TFCluster module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
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     <div class="footer" role="contentinfo">
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-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
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diff --git a/docs/tensorflowonspark.TFNode.html b/docs/tensorflowonspark.TFNode.html
index 2fd458ea..3295a4b7 100644
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+++ b/docs/tensorflowonspark.TFNode.html
@@ -5,13 +5,13 @@
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   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFNode module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFNode module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
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         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
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           <a href="tensorflowonspark.TFManager.html" title="tensorflowonspark.TFManager module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -304,13 +304,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFManager.html" title="tensorflowonspark.TFManager module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.TFSparkNode.html b/docs/tensorflowonspark.TFSparkNode.html
index f63a4b69..10341f6d 100644
--- a/docs/tensorflowonspark.TFSparkNode.html
+++ b/docs/tensorflowonspark.TFSparkNode.html
@@ -5,13 +5,13 @@
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   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.TFSparkNode module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.TFSparkNode module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
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     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
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         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFNode.html" title="tensorflowonspark.TFNode module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -73,7 +73,7 @@ <h3>Navigation</h3>
 </tr>
 <tr class="field-odd field"><th class="field-name">task_index:</th><td class="field-body">integer rank per job_name, e.g. “worker:0”, “worker:1”, “ps:0”.</td>
 </tr>
-<tr class="field-even field"><th class="field-name">cluster_spec:</th><td class="field-body">tf.train.ClusterSpec</td>
+<tr class="field-even field"><th class="field-name">cluster_spec:</th><td class="field-body">dictionary for constructing a tf.train.ClusterSpec.</td>
 </tr>
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 </tr>
@@ -286,13 +286,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFNode.html" title="tensorflowonspark.TFNode module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.dfutil.html b/docs/tensorflowonspark.dfutil.html
index 757e8f60..42bec6e4 100644
--- a/docs/tensorflowonspark.dfutil.html
+++ b/docs/tensorflowonspark.dfutil.html
@@ -5,13 +5,13 @@
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     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.dfutil module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.dfutil module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
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+        VERSION:     '1.2.0',
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         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFSparkNode.html" title="tensorflowonspark.TFSparkNode module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -248,13 +248,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.TFSparkNode.html" title="tensorflowonspark.TFSparkNode module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.gpu_info.html b/docs/tensorflowonspark.gpu_info.html
index 4db5479b..5def8bad 100644
--- a/docs/tensorflowonspark.gpu_info.html
+++ b/docs/tensorflowonspark.gpu_info.html
@@ -5,13 +5,13 @@
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   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.gpu_info module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.gpu_info module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
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+        VERSION:     '1.2.0',
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         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.dfutil.html" title="tensorflowonspark.dfutil module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -131,13 +131,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.dfutil.html" title="tensorflowonspark.dfutil module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.html b/docs/tensorflowonspark.html
index e517dfb4..5b8e2e3b 100644
--- a/docs/tensorflowonspark.html
+++ b/docs/tensorflowonspark.html
@@ -5,13 +5,13 @@
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   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark package &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark package &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="index.html" title="Welcome to TensorFlowOnSpark’s documentation!"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
       </ul>
     </div>  
 
@@ -129,12 +129,12 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="index.html" title="Welcome to TensorFlowOnSpark’s documentation!"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li> 
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.marker.html b/docs/tensorflowonspark.marker.html
index 834f23ff..fb13ebf3 100644
--- a/docs/tensorflowonspark.marker.html
+++ b/docs/tensorflowonspark.marker.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.marker module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.marker module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.gpu_info.html" title="tensorflowonspark.gpu_info module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -118,13 +118,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.gpu_info.html" title="tensorflowonspark.gpu_info module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.pipeline.html b/docs/tensorflowonspark.pipeline.html
index 062d913a..06dc963f 100644
--- a/docs/tensorflowonspark.pipeline.html
+++ b/docs/tensorflowonspark.pipeline.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.pipeline module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.pipeline module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.marker.html" title="tensorflowonspark.marker module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -213,6 +213,16 @@ <h3>Navigation</h3>
 <dt id="tensorflowonspark.pipeline.HasNumPS">
 <em class="property">class </em><code class="descname">HasNumPS</code><a class="reference internal" href="_modules/tensorflowonspark/pipeline.html#HasNumPS"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <code class="xref py py-class docutils literal"><span class="pre">pyspark.ml.param.Params</span></code></p>
+<dl class="attribute">
+<dt id="tensorflowonspark.pipeline.HasNumPS.driver_ps_nodes">
+<code class="descname">driver_ps_nodes</code><em class="property"> = Param(parent='undefined', name='driver_ps_nodes', doc='Run PS nodes on driver locally')</em><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS.driver_ps_nodes" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
+<dl class="method">
+<dt id="tensorflowonspark.pipeline.HasNumPS.getDriverPSNodes">
+<code class="descname">getDriverPSNodes</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/tensorflowonspark/pipeline.html#HasNumPS.getDriverPSNodes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS.getDriverPSNodes" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
 <dl class="method">
 <dt id="tensorflowonspark.pipeline.HasNumPS.getNumPS">
 <code class="descname">getNumPS</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/tensorflowonspark/pipeline.html#HasNumPS.getNumPS"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS.getNumPS" title="Permalink to this definition">¶</a></dt>
@@ -223,6 +233,11 @@ <h3>Navigation</h3>
 <code class="descname">num_ps</code><em class="property"> = Param(parent='undefined', name='num_ps', doc='Number of PS nodes in cluster')</em><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS.num_ps" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>
 
+<dl class="method">
+<dt id="tensorflowonspark.pipeline.HasNumPS.setDriverPSNodes">
+<code class="descname">setDriverPSNodes</code><span class="sig-paren">(</span><em>value</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/tensorflowonspark/pipeline.html#HasNumPS.setDriverPSNodes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS.setDriverPSNodes" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
 <dl class="method">
 <dt id="tensorflowonspark.pipeline.HasNumPS.setNumPS">
 <code class="descname">setNumPS</code><span class="sig-paren">(</span><em>value</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/tensorflowonspark/pipeline.html#HasNumPS.setNumPS"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tensorflowonspark.pipeline.HasNumPS.setNumPS" title="Permalink to this definition">¶</a></dt>
@@ -621,13 +636,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.marker.html" title="tensorflowonspark.marker module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.reservation.html b/docs/tensorflowonspark.reservation.html
index a416c54d..80d8e145 100644
--- a/docs/tensorflowonspark.reservation.html
+++ b/docs/tensorflowonspark.reservation.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.reservation module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.reservation module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.pipeline.html" title="tensorflowonspark.pipeline module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -292,13 +292,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.pipeline.html" title="tensorflowonspark.pipeline module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.reservation_client.html b/docs/tensorflowonspark.reservation_client.html
index 40e04d0c..c8aebdef 100644
--- a/docs/tensorflowonspark.reservation_client.html
+++ b/docs/tensorflowonspark.reservation_client.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.reservation_client module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.reservation_client module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -42,7 +42,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.reservation.html" title="tensorflowonspark.reservation module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -106,13 +106,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.reservation.html" title="tensorflowonspark.reservation module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/docs/tensorflowonspark.util.html b/docs/tensorflowonspark.util.html
index 4466d658..0b4d0d28 100644
--- a/docs/tensorflowonspark.util.html
+++ b/docs/tensorflowonspark.util.html
@@ -5,13 +5,13 @@
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>tensorflowonspark.util module &#8212; TensorFlowOnSpark 1.1.0 documentation</title>
+    <title>tensorflowonspark.util module &#8212; TensorFlowOnSpark 1.2.0 documentation</title>
     <link rel="stylesheet" href="_static/classic.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {
         URL_ROOT:    './',
-        VERSION:     '1.1.0',
+        VERSION:     '1.2.0',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '.html',
         HAS_SOURCE:  true,
@@ -38,7 +38,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.reservation_client.html" title="tensorflowonspark.reservation_client module"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" accesskey="U">tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>  
@@ -106,13 +106,13 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="tensorflowonspark.reservation_client.html" title="tensorflowonspark.reservation_client module"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.1.0 documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">TensorFlowOnSpark 1.2.0 documentation</a> &#187;</li>
           <li class="nav-item nav-item-1"><a href="tensorflowonspark.html" >tensorflowonspark package</a> &#187;</li> 
       </ul>
     </div>
     <div class="footer" role="contentinfo">
         &#169; Copyright 2017, Yahoo Inc.
-      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.5.
+      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.6.7.
     </div>
   </body>
 </html>
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 41b0d4ee..3ce5a86b 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 setup(
   name = 'tensorflowonspark',
   packages = ['tensorflowonspark'],
-  version = '1.1.0',
+  version = '1.2.0',
   description = 'Deep learning with TensorFlow on Apache Spark clusters',
   author = 'Yahoo, Inc.',
   url = 'https://github.com/yahoo/TensorFlowOnSpark',
diff --git a/tensorflowonspark/TFSparkNode.py b/tensorflowonspark/TFSparkNode.py
index 6e09f187..f0d3239d 100644
--- a/tensorflowonspark/TFSparkNode.py
+++ b/tensorflowonspark/TFSparkNode.py
@@ -33,7 +33,7 @@ class TFNodeContext:
     :worker_num: integer identifier for this executor, per ``nodeRDD = sc.parallelize(range(num_executors), num_executors).``
     :job_name: TensorFlow job name (e.g. 'ps' or 'worker') of this TF node, per cluster_spec.
     :task_index: integer rank per job_name, e.g. "worker:0", "worker:1", "ps:0".
-    :cluster_spec: tf.train.ClusterSpec
+    :cluster_spec: dictionary for constructing a tf.train.ClusterSpec.
     :defaultFS: string representation of default FileSystem, e.g. ``file://`` or ``hdfs://<namenode>:8020/``.
     :working_dir: the current working directory for local filesystems, or YARN containers.
     :mgr: TFManager instance for this Python worker.
